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Message-Id: <1472743673-15585-2-git-send-email-manfred@colorfullife.com>
Date: Thu, 1 Sep 2016 17:27:53 +0200
From: Manfred Spraul <manfred@...orfullife.com>
To: benh@...nel.crashing.org, paulmck@...ux.vnet.ibm.com,
Ingo Molnar <mingo@...e.hu>, Boqun Feng <boqun.feng@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, will.deacon@....com,
1vier1@....de, Davidlohr Bueso <dave@...olabs.net>,
Manfred Spraul <manfred@...orfullife.com>
Subject: [PATCH 9/7] ipc/sem.c: Remove another memory barrier.
As spin_unlock_wait() is defined as equivalent to spin_lock();
spin_unlock(), the memory barrier before spin_unlock_wait()
is not required.
Signed-off-by: Manfred Spraul <manfred@...orfullife.com>
---
ipc/sem.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/ipc/sem.c b/ipc/sem.c
index a5da82c..2bef9c0 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -280,11 +280,7 @@ static void complexmode_enter(struct sem_array *sma)
return;
}
- /* We need a full barrier after seting complex_mode:
- * The write to complex_mode must be visible
- * before we read the first sem->lock spinlock state.
- */
- smp_store_mb(sma->complex_mode, true);
+ sma->complex_mode = true;
for (i = 0; i < sma->sem_nsems; i++) {
sem = sma->sem_base + i;
--
2.7.4
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